The CadEnhance Symbol Description Language (SDL) Enables the Librarian or Engineer to Describe the Layout of pins and symbols from a very high level. It supports looping constructs and pin-name pattern matching which enables features designers haven't seen before in symbol creation tools. For example using one 45 line SDL file, you can create the symbol files for ANY FPGA in the Xilinx Virtex7 part family (some with over 2000 pins), and similar SDL files will provide support for Altera(Intel) and Lattice part families. While very powerful, the SDL is also very intuitive and simple to create.
Here we will cover the syntax and structure of the SDL, but in order to remove the intimidation factor, we will first show a few examples
A Few Examples:
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#SDL FOR DRAM PART #start symbol named DRAM_PINS DRAM_PINS= left=>clk_p left=>clk_n !BSS+2=> PSG_dq_w0:left=>dq[7:0] left=>spacer[1:0] clock:left=>dqs0 bubble:left=>enb_n0 PSG_dq_w1:right=>dq[15:8] right=>spacer[1:0] clock:right=>dqs1 bubble:right=>enb_n1 ; #end symbol named DRAM_PINS #start symbol named POWER POWER= LEFT=>VCCD RIGHT=>VCC ; #end symbol named POWER #start symbol named GROUND GROUND= BOTH=>GND ; #end symbol named GROUND |
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